On the Quantification of Boundary Layer Effects on Flame Temperature Measurements Using Line-of-sight Absorption Spectroscopy

Ma, Liuhao; Cheong, Kin-Pang; Yang, Min; Yuan, Chaokai; Ren, Wei

doi:10.1080/00102202.2021.1925657

Cited by 3 publications

(5 citation statements)

References 44 publications

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“…Despite the above limitations, scan-beam CST sensors are effective in fundamental combustion research, for example, characterising axial and radial profiles [35], boundary effect [36], and non-uniformity [37] of the lab-scale flames. It is worth noting that single-beam LAS to measure multiple transitions or broadband spectra can also indicate the line-of-sight non-uniformity of gas parameters [38,39].…”

Section: Scan-beam Sensorsmentioning

confidence: 99%

Perspectives on instrumentation development for chemical species tomography in reactive-flow diagnosis

Liu

McCann

2023

Meas. Sci. Technol.

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Chemical species tomography (CST) has been deployed in a wide range of applications in the last two decades for multi-dimensional measurement of gaseous flow fields. CST offers unique capability for spatiotemporally resolved imaging of multiple thermochemical parameters. It is fundamentally robust, highly sensitive, and adaptable to industrial processes and large-scale combustion systems. The instrumentation methods used to implement CST measurements are critical in determining the physical and chemical variables that may be imaged by CST. In this perspective, we have three main objectives: a) discuss recent advances in CST instruments from the viewpoint of optics and electronics; b) highlight the on-going challenges for systems to address the ever-increasing requirements on temporal and spatial resolutions; and c) consider potential developments for next-generation CST instrumentation.

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Section: Scan-beam Sensorsmentioning

confidence: 99%

Perspectives on instrumentation development for chemical species tomography in reactive-flow diagnosis

Liu

McCann

2023

Meas. Sci. Technol.

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“…Tunable diode laser absorption spectroscopy (TDLAS) is widely used for trace gas detection because of its characteristics, such as non-contact measurement, high sensitivity, and fast response time [ 1 , 2 , 3 , 4 ]. As two main techniques of TDLAS, the variation of line shape has an important effect on both direct absorption spectroscopy (DAS) and wavelength modulation spectroscopy (WMS) [ 5 , 6 , 7 , 8 , 9 ].…”

Section: Introductionmentioning

confidence: 99%

A Width Measurement Method of Line Shape Based on Second Harmonic Peak and Modulation Amplitude

Lin

Chang

Sun

et al. 2023

Sensors

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The line width of different line shapes is a very important parameter in absorption spectroscopy sensing techniques. Based on the high sensitivity and low noise properties of wavelength modulation spectroscopy, we report a novel line width measurement method. After theoretically proving the relationship between line width, modulation amplitude and the amplitude of the second harmonic at the center frequency, the absorption lines of CH4 near 6046.96 cm−1 and CO2 4989.97 cm−1 were chosen for simulation, and the relative errors of the line width between our method and theoretical data were kept at about 1%. A distributed feedback laser diode operating near 1653 nm with three different concentrations of CH4 was used for experimental validation, and the results were consistent with the numerical simulation. Additionally, since only the peaks of second harmonic need to be measured, the advantages of wavelength modulation can be utilized while reducing the difficulty of data acquisition.

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“…It is therefore necessary to study the IA error generated by signal distortion in a nonuniform flow field. Previous studies identified the nonuniformity of the flow field (especially the boundary layer effect) as an important factor affecting the accuracy of TDLAS measurement [17][18][19][20]. Xiang et al proposed an energy-temperature curve for estimating the effects of thermal and concentration boundary layers and assisting the selection of candidate absorption lines [17].…”

Section: Introductionmentioning

confidence: 99%

“…Qu et al quantified the effects of the temperature gradient and thermal boundary layer thickness on the spectral collisional width and gas concentration measurement [19]. Ma et al quantified the uncertainty in the measurement of the TDLAS-determined temperature [20].…”

Section: Introductionmentioning

confidence: 99%

“…Measurement noise varies with changes in the test system, so this variation is not considered in the current study. We focus here on the IA error generated by the coupling of the nonuniformity, the absorption line features, and the line-shape fitting function, which are inherent to the Previous studies identified the nonuniformity of the flow field (especially the boundary layer effect) as an important factor affecting the accuracy of TDLAS measurement [17][18][19][20]. Xiang et al proposed an energy-temperature curve for estimating the effects of thermal and concentration boundary layers and assisting the selection of candidate absorption lines [17].…”

Section: Introductionmentioning

confidence: 99%

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Error Analysis of Integrated Absorbance for TDLAS in a Nonuniform Flow Field

Lin

et al. 2021

Applied Sciences

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As an effective optical diagnosis method, tunable diode-laser absorption spectroscopy (TDLAS) has increasingly moved to examine nonuniform flows, such as two-dimensional combustion diagnosis. To investigate the effect of nonuniformity along the line of sight in a measurement using TDLAS, the integrated absorbance (IA, the key intermediate quantity in TDLAS) error was quantified. The error distribution is obtained from the line-shape parameters through the comprehensive analysis of the line-shape function and the fitting method. The effects of the fitting function and the absorption line overlap are also considered. A general method for estimating the error is given. The work illustrates the applicability of TDLAS technology in nonuniform flow fields and provides input parameters for the evaluation of tunable diode laser absorption tomography error.

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On the Quantification of Boundary Layer Effects on Flame Temperature Measurements Using Line-of-sight Absorption Spectroscopy

Cited by 3 publications

References 44 publications

Perspectives on instrumentation development for chemical species tomography in reactive-flow diagnosis

Perspectives on instrumentation development for chemical species tomography in reactive-flow diagnosis

A Width Measurement Method of Line Shape Based on Second Harmonic Peak and Modulation Amplitude

Error Analysis of Integrated Absorbance for TDLAS in a Nonuniform Flow Field

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